package socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

/**
 * 聊天室的服务端
 */
public class Server2 {
    private ServerSocket ServerSocket;

    public Server2() {
        try {
            System.out.println("正在启动服务端");
            ServerSocket = new ServerSocket(8088);
            System.out.println("服务端启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        try {
            int i = 1;
            while (true) {
                System.out.println("等待接收客户端");
                Socket socket = ServerSocket.accept();//接电话
                System.out.println(i + "个客户端已连接");
                i++;
                //启动一个线程与该客户端交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        //main方法是静态方法，不能访问普通方法
        //调用构造器初始化数据
        Server2 server = new Server2();
        server.start();
    }

    /**
     * 该线程任务负责与指定的客户端交互 clienthandler：客户端处理器
     */
    private class ClientHandler implements Runnable {
        private Socket socket;
        private String host;//记录该客户端的IP地址

        public ClientHandler(Socket socket) {
            this.socket = socket;
            //通过socket获取远端计算机的IP地址的字符串格式
            host = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println(host + "说：" + message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
